Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecfbd4e4a52be19…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 19:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d51319d3c89092a042f0d121b45d13e SHA-1: a7cc561d79339957c80e387cacb532941c7391d7 SHA-256: 5ecfbd4e4a52be19be5d1bd24e50aee4da7b83cd2474f4b420041bfb4e1ef017
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. One prominent link redirects to a known malicious infrastructure, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to musical scores, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=bwv+1006+piano+pdf
    • http://files.weareallrare.com/uploads/1/3/1/4/131407179/nasukuw.pdf
    • http://files.professorwillis.com/uploads/1/3/0/9/130969819/3536095.pdf
    • http://files.mapledurwellvillagehall.com/uploads/1/3/2/6/132696483/4159741.pdf
    • http://files.islandplaster.com/uploads/1/3/1/4/131406527/565007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/40394365717.pdf
    • https://cdn.shopify.com/s/files/1/0436/0830/9923/files/96477338597.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/vupipiruvid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/gapipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4499/files/jujidetutafodogasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4102/1334/files/11157946825.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/21700448490.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/gatemel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/kizaxavebifuwutosaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/57620171146.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/19064315436.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b17.bin
0dd4f1f1adc27e55e4e7af570dbda38dc9e0d1c0f687c72c9fe9b53b1e5010db
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 4868 bytes
font_01_sfnt_off00008bbf.bin
86ab795b1b3cde0fc089f3b38031f14e53488f304d7b14e625b2078b9fd435df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBF 11168 bytes